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forms from hyaline cartilage that is the shape of the future bone
EX. most of the bones of the skeleton

Osteoclasts

bone destroying cells

Osteoblasts

bone forming cells work to get just the right amount of bone tissue in just the right places

Parathyroid

hormone stimulates osteoclasts to break down bone tissue and thus releases calcium into the blood

Calcitonin

(from the thyroid gland) stimulates osteoblasts to build more matrix and thus remove calcium from the blood

Joints

places where bone (articulates with) meets bone

3 Types of Joints

-fibrous: bones that closely contact each other EX. sutures of skull
-cartilaginous: when hyaline or fibrocartilage is between the bones EX. intervertebral discs
-synovial: most of the articulations of the skeleton - these joints allow for much movement

Examples of Synovial Joints

-Pivot: btw. the head and the atlas
-Hinge: at the elbow & knee
-Ball & Socket: at the shoulder & hip
-Gliding: at the carpals & tarsals
-Saddle: at the thumb